Sorry but I did not check the size of OP's mill.
As I now check the Amadeal website it seems that a lot of their machines have a 25 designation but not always a lot of dimensions , so easy to presume it would be comparable to Sieg SX25, Sealey SM 25 etc. I stand corrected on that.

With regard to bearings I found that using the bearing blocks supplied for, or with the screws gives the most convenient set up. These bearings are available in pairs , (one floating, and one fixed but with a preload locking nut)
https://www.ebay.co.uk/itm/Ballscrew...97.m4902.l9144
Delivery is a bit slow from the far east at the moment .

With this arrangement however there may have to be a significant stand off for the stepper in order to accommodate the flex coupling. In my case the standoff dimensions were 60mm and 90 mm. This does not have to be a problem .