I used it for single doors and it works great! Would highly recommend, especially if installing doors by yourself. Not sure it’s designed for French doors.
Yes you can. Very easy to do and quick. Great videos on YouTube as well
Will not eork with brick mold attached
On the outside of the door frame. You might need to remove casing if there's casing. I had to do that. You want them where the door is to handle the weight of the door
At max you can have 3/4 of an inch.
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Put them on the inside also, very sturdy
The first side of the frame you install (secure to the wall) must be level or Higher then the other side. If needed, put temporary/permanent shim under this side of the frame. Then, you secure it to the wall with the screw. Make sure it is perfectly level vertically. Step #2: Make sure the door reveal is good and latches properly. If needed, put a temporary or permanent shim under the second leg of the frame. When everything is good, screw the second side to the wall. It is much easier then it look
All door are installed in the same manner, they should work just fine.