Re: Active Active HA
You mention stacked switches are you doing a LACP bundle between each FGT200E to each switch member ? Regardless, the A-A or A-P in a stacked env will not matter. I would also ensure ( I believe that you are ) that each HBDEv interfaces are cabled back-2-back and introduce into the switch stack.
So if your looking for the max in HA and with bandwidth you could take fgt-port1+2 and create a bonded interface and cables these to switch members sw1+sw2 and fgt-ports 3+4 as port-member cabled to switch members sw1+sw2
Finally for layer3 interfaces you could easily do 802.1q tagging.
PCNSE, NSE , Forcepoint , StrongSwan Specialist