question about the mt in the middle "img included"

I have a question about this solution :


Some notes :
The main Mikrotik is the hotspot server , it is control every thing with clients.
The Second Mikrotik has one lan and one wireless lan .
the question is : “if my imagination was right” in which setting the second mikrotik wireless should be on ???
to be able to receive with wireless nic and send again to the other clients and AP-units behind , and link at the same time the wired clients behind without control.
The clients behind the second MT use the first or the main one as their gateway .
Is it possible ??
the second one actually was a tp-link unit too “it was doing what i want now”, but its quality was going down by time ,
so i wanna replace it with mt system .