I kind of agree with Fyas but at the same time I want a Mac ... with Apple Silicon... now.
I was able to get 5120x1440x120hz with SwitchResX on the Mini but still had a few (lots) issues with waking from sleep or shutdown.
So this morning I picked up a Caldigit TS3 and MacBook Pro M1 from the local Apple Store.
The TS3 seems (up to now) to solve all the sleep and shutdown issues. An SwitchResX 4.11 beta also works great.
So right now the MacBoook is single cabled to the TS3, the TS3 is single cabled DisplayPort to the G9 and everything works like I want. I need the TS3 anyways because I have a ******** of geeky stuff to plug in.
Of course it's the third time I come here and claim to a have winning combo so I will let that simmer a couple of days. If it still works I will order a third MacBook Pro M1 (with the specs and keyboard I want) and return the Mini and MacBook that I have right now at the end of the Xmas return period (jan8th). TS3 stays whatever I choose.
Second choice is to keep the Mini and the TS3 (seems to work also).