The Summit has support for 6x 2.5" drives or 2x 3.5" drives and 2x 2.5" drives. The case has 2x 2.5"/3.5" mounts on the backside of the motherboard plate, and 2x dedicated 2.5" mounts in the bottom.
(There are clips in the bottom which you just push the 2.5" drive into)
f you are using a rear connector motherboard, you can move the rear motherboard plate mounts to the left to accommodate the rear motherboard connectors, as shown below:
This would however require that you move the cable mounts to alternate positions than the pre-installed. See below for locations these can be put:
