5 routers one proxy how to ?

Hi.

I don’t know if I am asking the impossible.

New to MikroTik.

My Current configuration.
5 x Mikrotiks, 433AH utilizing all 3 wireless interfaces.
Each Mikrotik has its own DSL line with own gateway.
and each ether2 goes to a switch for backup, encase an DSL line goes down.
So i can route to other line for backup.

I would like to implement 1 proxy server that all of these routers can use to cache http traffic on.
I am thinking of using Squid as a Proxy server. Maybe use the parent proxy feature on Mikrotik for this ?
Will this work or is there a whole different way to go ? (each line with his own proxy)

No answers ?
No Ideas ?

you can set up your proxy server connected to switch and set up parent proxy feature on your RouterOS routers. Maybe add one more router before proxy to load balance proxy requests over all the possible connections or add dedicated connection to your proxy.

the problems are - proxy requests are just that, proxy requests, you do not know from where request originated, so, all the traffic from proxy will go through one gateway, that is not what you want, hence, router to do load ballancing