IIRC, an AFMU continues to work normally even at 1% integrity. And if it goes to zero, repair/reboot will get it working again, no explorer needs two AFMU's (OK, it gives you a bit more ammo, but you can synthesise that if you're carrying the right materials).
With 8 slots, I'd go for:
Fuelscoop
FSD booster
Shield
Dual SRV
16t CRCR
DSS
AFMU
Collector Limpet Controller
(no need to carry actual limpets, synthesise if needed)
With 8 slots, I'd go for:
Fuelscoop
FSD booster
Shield
Dual SRV
16t CRCR
DSS
AFMU
Collector Limpet Controller
(no need to carry actual limpets, synthesise if needed)