We've got the CX-5 with factory rails/crossbar and nothing easily works on it. Luckily we followed the hatch clearance guide from Thule and went with the Force L that worked but as OP mentioned, there is no room for bike trays on the side. And if there were, they'd hit the hatch as well. Not...
Factory rails and crossbars are a very easy install though you need wire snips or a hacksaw to take the pieces out of the rail covers. Fully doable from none to full setup in an hour. I would recommend factory for looks alone. Cross bars are adjustable back and forth though I've had one of...