Print Settings:
Voxelab Aquila, Draft (0.2mm), Infill 15%, PLA
Base and Mount both printed with 3 line skirt. 
Base printed flat, with pockets for hex nuts up, support switched Off.
Mount printed with Tree support, zigzag pattern, support on for touching build plate only.
With Cura 5.3.0, the preview showed it wanted to also add support for the hole and threaded hole for the optional 6-32 x 1-1/2" screw. I changed the support overhang angle from 50° to 80° and that stopped that support, which would have been a pain to remove, and not really necessary. The upper curved slot and mounting hole were not and did not need support. The clearance for the beeper and the bottom bridge were the only areas to get support, it was easily removed.

The Base:
Insert two 6-32 x 3/4" machine screws into the two center countersunk holes on the back of the Base. Screw them tightly into two 6-32 hex nuts dropped into the pockets in the face of the Base. These will be used with two additional hex nuts and a 5/16 nut driver or wrench to secure the Mount with Display in place. The Base is then mounted to the side of the printer using two of the M4 screws and T-nuts through the diagonal holes remaining.

The Mount:
After printing and removing the two support structures, gently screw the (optional) 6-32 x 1-1/2" screw through the clearance hole and into the printed threads across from it. Note it is not designed to go all the way through, just enough to hold it in place. Then remove the screw to clear the printed threads. They will be tight. Now referring to the photos, hold the mount over the back of the display with the wide sections of the slots over the two pairs of stabs and lower it into place. Note that the control knob is at the pivot and bridge end of the mount. Now slide the open end of the slots up until it stops. The stabs will be snugly held into place. Gently screwing the 6-32 screw back into place will secure the display onto the mount. Plug in the ribbon cable, and place the assembly onto the 6-32 screws protruding from the base and secure with the two remaining 6-32 hex nuts, at the angle that suits you.