I'm sorry to make this complicated... lol
I like the routers to have DHCP because I can set Access Restrictions to 3 teenagers
and DD-WRT has great features for that.
As you can see the 2nd Router (AP) is connected to the 1st Main router... my 2nd AP is directly connected to the Modem and it provides greater internet speed that way...
I had it setup like the picture but with this new modem providing several ports... my home internet is much faster now.