I installed a front sway and can tell you that I would recommend dropping the subframe as the additional room is nice to have.
Buuut, the bolts that hold the rack in place can be accessed from the wheel wells with the proper tools - looong handle ratchet, extensions, maybe a swivel as well. you may have to disconnect the oem sway from the end link for extra clearance,as in you MAY only have room for tiny "baby" turns of the ratchet as it hits the sway...
passenger side has tons of room. it's the driver side, with all the linkage, that's a bit of work.