Now get the posts and screw it in place.
To get the best results use a ruler and leveler to mark the positions you want to screw them into. This will prevent any slant and crooked installation.
Place the post in position and screw it on tightly. Give the post a slight shake to see if it moves.
Then place the rod that goes the middle and screw on the other post.
If your racks were glued in place, you can skip step 2 and 3. Just add the caulking, paint, and glue on the rack just like it was before.
Glue installations are much easier. But they tend to come off too soon. If this is the way you want to go make sure that the glue you are using is waterproof and strong.
But it’s best to shift to a screw-on towel rack as they are more durable.
Now you are done! You have yourself a steady and sturdy towel rack that doesn’t move, and the wall behind looks untouched!