A few Pro-Tips: “Pro”-tip 1: Measure and map out the placement of the shelves twice before anchoring (once they’re anchored on top of the wallpaper there’s no turning back, unless you’re ready to re-wallpaper).
“Pro”-tip 2: If using the linked floating shelves from Houzz I recommend using these E-Z anchors instead of the anchors they come with.
“Pro”-tip 3: Install the shelves upside down for a straighter look.