Hey there! Thank you for your interest!
If I'm not mistaken (I've never used it) RPG Maker is a 2D Game Engine. This is a pack of actual 3D Assets. I don't know if you can directly import these into RPG Maker but I suspect it won't work. That said, you can always load them into a 3D software (I'd suggest Blender, since it's Free and Open Source) and render them out to Sprites to use in any 2D Game Engine.