Sebastian is a big puppy!
I don't see how wall-mounting would change anything unless you plan to put them at least 7 feet high!
He was probably getting a really nice massage for his aching/teething gums and couldn't help himself!
Maybe you should get one of these for him!
Buy Nuby Vibe-eez Soothing Teether, Octopus at Walmart.com
www.walmart.com
He'll destroy it in short order ($6) and you'll want to make sure he doesn't eat it (with the battery), but if he really likes it, you can get one of these with inexpensive replaceable tips to use on him!
magicwandoriginal.com
... and who knows what kind of fun new play games you might come up with!