Hello everyone,
I got 3 Mikrotik hap ac2 and I have a long Y shaped house and unfortunately the ADSL cable is at one of the edges and internet connection does not reach the other 2 edges.

My idea was to:
- Connect the Mikrotik to the modem in AP mode
- For each of the other two edges, I was planning to put a "Station bridge" on the 2.4GhZ and a bridge on the 5GhZ
- All the SSIDs will have the same WIFI SSID

Is this the right way of doing this? Will I get seemless connection across the house?
Since they are all mikrotik, is there any particular setting that will make them perform better?

Your approach is good..BUT...
I would use the 5Ghz band between the Mikrotik's since you can achieve a greater bandwidth than with 2.4Ghz...
So yes, if you set your first Mikrotik to AP Bridge and the 2 others to station Bridge everything will be fine...
You will use the 2.4 Ghz Band to AP Bridge Mode for your client devices to connect to the Internet...
Be sure to check the Tx/Rx values of your Station devices to be within normal limits, around 70dbm the most and your CCQ when there is traffic through your links should be above 80%...

Let me take a contrary tack... if the 5GHz frequencies work interunit, then fine; but you may discover that need to resort to the 2.4 instead to penetrate all those walls, especially the exterior walls.

As far as naming the SSID's same or different, there are issues either way. If they are all the same, you can register to one that isn't the strongest one and not be able to force a better connection. If they are all different, then newbies and guests will have to accept three networks and type in the password three times. I usually throw my hands up by using the MT feature of being able to define virtual APs -- on each machine, I have one AP with a common SSID, and one AP with a unique SSID. This lets the power user lock onto the particular AP he wants, while letting the low-information user do the "easy thing" that mostly works everywhere.

I agree, if the frequency is lower it can penetrate walls and objects better... However if the 5Ghz band does not work at all because of walls or anything am sure that the result with the 2.4Ghz will be bad as well...
So there would be no point of such implementation in the end...

You can as well use some powerlines and solve the wireless problem...

Run cables...always.

Run cables...always.

That is always by far the Best...

Even more basic than that, where is the routing LOL. All we have is one modem and three APs, but hey you guys are the experts... ;-P

(PS, yes ethernet is best, secondarily you can use powerline, thirdly there may existing coax which can be used as well)
(ethernet can be run through the attic or basement and across...... be inventive)

All we have is one modem and three APs, but hey you guys are the experts... ;-P

haha @anav we are just trying our best...
I guess the modem is actually a router-modem and the OP will let the routing there...

All we have is one modem and three APs, but hey you guys are the experts... ;-P

haha @anav we are just trying our best...
I guess the modem is actually a router-modem and the OP will let the routing there...

My point exactly, stop the bad habit LOL.

I must admit that i guess a lot...

Hello you all, thank you for all the useful feedback!

So I am currently running my ISP modem/router also as router.
However, it seems to crash 2/3 times a day and I was considering the ISP modem to feed directly into one of my mikrotik routers and make it the router (and disable the router option from the ISP modem). Dos that meant that I need to plugin a lan from my modem into ethernet 1 of the mikrotik?

Yes...But...
If you set your ISPs modem in Bridge Mode, meaning it does no routing functions anymore, then somehow the Mikrotik must communicate with your providers netowork, that might be a PPPoE connection, a static IP etc... But i do not know what options your ISP will give you...

Yes...But...
If you set your ISPs modem in Bridge Mode, meaning it does no routing functions anymore, then somehow the Mikrotik must communicate with your providers netowork, that might be a PPPoE connection, a static IP etc... [b]But i do not know what options your ISP will give you[/b]...

That is why we ask questions and get facts, before we attempt to config.
I see an ole dog can learn new tricks :-p