Screwed in for me as well and sealed with dicor afterwards. I would never trust tape to hold a panel on the roof. Even if the tape is strong enough I would not trust the rubber roof membrane not to tear away.
The only way I would consider adhesive is if I was using the flexible panels that lie directly on the roof and would not have any wind drag.
I saw a solar install that used well nuts recently and thought that was a good idea as well. Bigger holes in the roof though but self sealing.
Let me google that for you
You may have issues with roof space if you ordered a fully loaded model with dual AC and multiple roof vents. If not though 4 panels should fit fine.