Amazon has the NETGEAR Orbi Wall Mount Kit on sale for $9.99 with free shipping on $25+ or with Prime. Also at B&H Photo. Ideal for mounting Orbi satellite units around home. 

Compatible with: CBR40, CBK40; LBR20; RBR20, RBS20, RBK20, RBK22, RBK23; RBR40, RBS40, RBK40, RBK43; RBR50, RBS50, RBK50, RBK53, RBK53S; RBK352, RBK353; RBK752, RBK753; RBK852, RBK853