The new HAC125DX telescope has a front mounted camera. It needs a camera with a small diameter, ideally less than 53mm. It would also be good if it had a rear-mounted usb-c connector. The small 1.25” format guider cameras that ZWO use (e.g. Asi220mm) would be the ideal format.
The three best sensors would be those used in the following cameras (i) Asi676mc, (ii) Asi585mc or (iii) Asi533mc. If I had to pick one it would be the 676mc sensor: I’m currently using the Asi676mc with the HAC125DX and it works very well but the side mounted USB-B 3.0 connector is a real nuisance, and the body diameter is 62mm rather than <53mm.
Andy Lucy