Obviously do this with the windows all the way down.
In channel window visor problems.
In channel vent visors are designed to perfectly fit onto your car windows channels while tape on vent visors require adhesive to fix them on the window frame.
Obviuosly the first time you put them on and roll up the window it ll be a tight fit but that s what helps them seal.
Also you will need to tug outward on the visor when you roll the window up the first few times or the window will catch on the edge of the visor and possibly break.
No window contact also because of their out of window design tape on deflectors don t make any contact with the glass or window mechanics.
That means there s no risk of scratching the glass or interfering with window operation.
Quick discussion on installation of in channel versus exterior auto vent shade window visors.
The heat will allow the visors to flex into place.
I ve only had in channel visors on my vehicles as i think the outside mounted ones look pretty awful just my opinion but i ve never had any problems with the power windows not operating properly.
What you should do is take a pair of tin snips and cut the visor in the middle to make it easier to take out of the window frame.
Pull out the pieces and don t worry if the rubber gasket comes out with it because you can clean off the adhesive and pop the gasket back in the channel.