Thank you for the help. I don’t wanna drill for resale value of the vehicle.
A properly installed NMO mount does not impact resale value.
I've traded in a lot of trucks with 1 or 2 NMO mounts on them and never once was there an issue. Traded in cars usually are purchased by brokers and redistributed to other dealers. All they care about is milage and general condition. You can put an NMO rain cap over the mount when you sell it, or screw a cellular antenna on it and tell them you "get more bars" on your cell phone with it.
You'll risk damaging the paint with mag mounts or trunk lip mounts, damaging the coax with it slammed in doors or pinched in windows.
I understand not wanting to drill, but resale value is not a concern.