I need to agree there. Seems to be a lot of overthink (which, in fairness, I did as well). The keelguard is much easier than everything seems. In fact, I don't think I got the taping right and in the end I figured out it didn't matter. It is on the bottom of the boat, probably only 1" off of the keelguard, where no one sees it and certainly no one notices it. I have NEVER had anyone on my boat say, "Oh, say, I noticed while we were floating back there that, when your boat rode up high on a wave, I could see a little bit of dull to 1/2" to the side of the keelguard..." I have not even said that, and I know it is probably there.
The important thing is that the keelguard protects the keel from stuff. If you should occasionally beach your boat or accidentally hit that sand bar, it helps make sure you do not have a major expense from that. I recommend it. And many folks can report good experiences from a) one falling off and the company standing behind it or b) hitting something and having less damage and/or the company standing behind it.
So, don't get hung up on the install. It's not that bad. And don't fret the color (I put a black one on my white hull). Just pick something and do it to help protect your boat from damage.
PSA, IMHO, and thanks for listening to the rant.