I would agree with 4jeepn...stress cracks...I have even seen them develop on the ones that have a roof rack.
If you wanted to put the anchor points in the roof, it is possible if you know how to cut out and re-fiberglass a section in, but is that really worth the hassle?
When i switch from the hard to to no top in the spring,I do it by myself with a 3 man engine lift. I bought a 4 pack of those cheap ratchet straps.
lift the top up in the back and put a 2x4 across the body, attach 2 of the straps from the rear corners up to the lift. same with the front corners at the back of the door openings.
lift up on the engine lift to provide tension, and adjust the straps accordingly till the top is level for a lift. then just back it off the jeep.
reverse that order in the fall and its back on...and i dont have any holes in my roof to worry about cracking or leaking. and i did it by myself...Good Luck.