Best Way to Move the Camera Up & Down Slopes?

Not at the moment. I have the movement bound to WSAD for X&Y axis, and am not looking to give the camera a keybind for the Z axis. I’ve looked all over for other approaches to having the camera float above the ground and move up and down slopes while maintaining the same height above ground and am surprised that I’ve found only 3 other conversations about this, none having a solid answer for RTS & Top down style games. Most floating camera questions pertain to 3rd person and FPS games.