We’ve been using this enclosure for a jumbo litter pan (25x19x10 in).

Sweet Barks X-Large Designer Cat Washroom Storage Bench Cat Litter Box Enclosure Furniture Box House with Table, Big Enough for Automatic Litter Box Or Two Litter Boxes. https://www.amazon.com/dp/B07ND5FD1Q/ref=cm_sw_r_cp_api_i_6XDR2AG9TTANEQZVE4AT?_encoding=UTF8&psc=1