What type of substrate is this going over? Gypsum board, plywood, or other?
If plywood, you might consider installing using an anti microbial urethane hardwood flooring adhesive in conjunction with metal fasteners and possibly even do a shiplap profile with nickel gap spacing to allow for expansion, and prefinish all sides with a solvent borne urethane or varnish. RMC doesn’t hold up too well in wet locations.
edit: 5/16” material might be a bit delicate for a shiplap profile
If plywood, you might consider installing using an anti microbial urethane hardwood flooring adhesive in conjunction with metal fasteners and possibly even do a shiplap profile with nickel gap spacing to allow for expansion, and prefinish all sides with a solvent borne urethane or varnish. RMC doesn’t hold up too well in wet locations.
edit: 5/16” material might be a bit delicate for a shiplap profile