Make up your mind!
Do you want it on, or off?
If it is strong enough to hold all of it when positioned vertically (almost all of the weight is put onto the bottom piece), then it will be too strong to remove when you want to...
I suggest silicone sealant as the best thing if you want to remove it (and hope that it holds).
Or go for a grab adhesive (and hope it comes off later).
McLaren