At first, I try to add a tablet in the empty space behind the toilet, but it fall on the floor. Small piece stay in place. I use lego plate to hold my key and silicon is good enough.
@Clopidogrel, well, here's a thread titled screw or glue with a vote for command strips! We use them at home on wood and wallpaper, move them around without ill effects, etc. This thread also includes some good photos of construction details. I also use museum putty at home for items I want to stay in place on horizontal surfaces and know that's been mentioned on the forum. Command also makes strips for use in wet areas. There are other caveats re weight, ambient temperature etc.
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TV: 2006 Chevy Avalanche LT Z71 aka: WhiteWolf, or 1972 Chevy Custom10 P/U aka: SnarlingWolf
Spokane, Wa.
Eric aka: Lone Wolf
http://tab-rv.vanillaforums.com/discussion/4887/screw-or-glue
T@Bit@t 2015 S Max Outback, ‘18 V6 4Runner