I lived in a gnarly parts before and had the same experiences Snoop. Like the last member stated use fasteners that most thieves aren't equipped to remove. I use lock nuts washers and flat head screws. I insert the screws with washers through the back so all that is exposed is the nuts and washers. I tighten them down just enough so that they spin if someone tries to remove.
If it takes me 10 minuets to remove or install that's ten minuets you have to call the pigs or catch them your self. I prefer to mount to factory plastic panels so there's another five minuets to remove and it's not grounded either. I insert a bowie knife under the front seats point sticking up slightly into foam rubber under seat to hold in place while butt is against floorboard. This trick worked once for me and the thefts stopped! My crap was getting lifted every week till I got pissed enough to think of it! I even started leaving the car unlocked because I grew tired of replacing windows. The last time it happened the door was wide open and interior light was on but everything was still there! Even the knife which was protruding through the seat! The next day me and the bro in law drove around the neighborhood looking for someone walking with a limp, in about 5 minuets we saw a guy walking with a limp, it was a neighbor kid and when he saw us he tried running
I grabbed him and was bout ready to throw him in a full nelson and beat on his peanut brain when the bro in law stopped me cause he was 15. I found the neighborhood bully who was 16 and paid him 20 bucks to kick his ass and get my shit back. I got about half my crap back and split it with the bully! The moral if there is one? A: out of site out of mind B: Alarms keep honest people honest C: if you see baggy pants turn it down D: no stickers that reflect you have a system E: don't have your alarm installed by people that look they would rip you off, I worked at a shop where 2 guys would copy your car and house keys and copy your registration. They also rigged your car so they could disable the alarm
F: alarms are only good if you can hear them or they have a remote since most people when they hear an alarm don't even bother to see WTF is going on due to false alarms.
Not the best picture of the fasteners but it will give you the idea...