Treantmonklvl20
Explorer
Glyphs of Warding - both protective and offensive - should be everywhere in a wizard's home so they can be easily activated. Indeed, activating a GoW could be a Lair Action.
Consider also the floor trap: the wizard has a highly flammable carpet. The carpet covers numerous GoW. Burn the carpet and the floor becomes a huge trap. Even better if the ignition of the carpet is initiated by another GoW.
Yep, very useful for all those adventures where you are navigating your own home. That said, it's a bugger to face when an NPC can use them to ignore concentration restrictions. I recently ran a 3rd party adventure where the enemy hag did just that. Players were not impressed with me.