RB1100 setup RFC

Hi!

Am currently setting up a RB1100 for the following environment :-

2x FTTH (5mbps each); same ISP; same gateway IP (ISP side); same subnet (dhcp)
4x 52ports gigabit switch
some number of AP (dd-wrt) to configured to a VLAN and hotspot enabled
some number of servers (connected to gigabit switch)
some number of network printers.
users to be congfigured to 2 VLANs

Question:
Bearing in mind 2x switch group (1Gbps to CPU each) and 3 ports (1Gbps to CPU each). Is there an optimum ports usage for my case? If yes, please suggest.

I’ve been digging around for this information as well so let me know if you see anything. My setup will simply be having two RB1100’s running in a public firewall utilizing VRRP. No NAT or anything else.