F5 redundant connection

do you mean which ones will work or which one is best? a lot will depend on your requirements. so provide some more information.

for example why do you have ones with and without an extra switch layer? which you point out as L2, but you also say VRRP which would mean L3.

the cross part (C and D) will primary depend if on the SRX part it is allowed to do so, is it seen as one device or can you make aggregated connections over multiple devices?