Different sizes exist (eg for double layer plasterboard, or 9.5mm vs 12mm), they're easier to use with the setting tool, and you can swap in any screw of the right thread (M5 here) to get a more appropriate head.
You could use a batten, or just fix the rail directly - whatever works best for space or for looks.
I guess the batten might let you use more fixings and spread the load more: if you're going to have a significant cantilevered load I'd try to ensure you're fixing into studs or into the wall behind.
They're decent for light loads in shear, but I'd be inclined to go for a hollow wall fixing like https://www.screwfix.com/p/easyfix-hollow-wall-anchors-m5-x-52mm-100-pack/5643p
Different sizes exist (eg for double layer plasterboard, or 9.5mm vs 12mm), they're easier to use with the setting tool, and you can swap in any screw of the right thread (M5 here) to get a more appropriate head.
You could use a batten, or just fix the rail directly - whatever works best for space or for looks.
I guess the batten might let you use more fixings and spread the load more: if you're going to have a significant cantilevered load I'd try to ensure you're fixing into studs or into the wall behind.