Have you seen this thread, it covers a huge amount of options including ‘Magic Arm’ setups on hardware store pipe but also copy stands built from extruded aluminium sections - and much more besides!. I get the impression that the Magic Arm is very solid,but you have to be clamping it to a column that is equally solid. As you probably know already certain enlargers convert easily to copying stands (but many don’t).
I’ve seen the Leofoto G2 geared head recommended by experienced ‘camera scanners’ so I think it must be good. A tripod leveling base can work well also, particularly those with screw adjusters on the lines of the (expensive) Manfrotto 338 but other types as well.
Personally I use a large DIY leveling baseboard which also allows precise alignment and keeps the camera close to the column and also keeps the suspended weight down.