No, you don't have to put paste around the wafer tape...some people lay down on their bed or the floor to get a smooth seal!
What brand of appliance are you using? The wrinkles really shouldn't cause too much of a problem but you could put pieces of the pink waterproof tape over those edges just to be sure
In the US we have a GREAT product called Sure Seal Ring. If you can get some, they're great, especially for the situation you describe! They are a waterproof/breathable barrier over the wafer tape that keeps everything dry and secure and you can just towel off and go!
Glad you are already home recovering...take it easy for a little while...you did just have surgery