Through trial and error, I found out that there was another way to make corners for strips without cutting and risking the waterproofing. What I did was I made a loop on each corner of around 10cm in length and assigned them to a group that declares them as null pixels which mean they will not show any light. I put this group at the bottom of the sequence, and assigned the off effect so that as the sequences progresses, this group will be off all the time. Not sure if anyone else has any other ideas on how to go around corners using strips, but if anyone does, please comment down below.