New Updated (UTC Jan 7) Added an extended right bottom, image is in green

Lowered the Tablet top guide (to the back) adds to general support.
Left or Right (bottom stands) for the X56 HOTAS positioned over the screw holes (or use both) which are countersunk

X55 Not tested assume the front holes are the same (feedback says it works no problem)

Works for me with cable ties (3) if you don't have a bolt long enough, fed though the X56 screw holes to my Monster Tech desk mounts underneath

Printed on Monoprice MP Select Mini 3D Printer V2 120mm x 120mm
Using Cura 4.4.1 Default PLA on fine settings with a brim.
Materials settings, Print temp 205, Bed temp 50 to use with esun PLA+ Black

As a newbie printer re-designer still learning best practice for strength, these are my setting, which makes for a long print time.

Infill for the Tablet Bottom 40% using infill pattern Gyroid Fine takes about 3/4 hours
Infill for the Tablet Top 40% using infill pattern Gyroid Fast and printed on it's side should take about 4 hours (your choices may vary for both)

I did have issues with supports leaving marks, rotation and using tree supports helped you may come up with a better solution

The Tablet Top has a guide to line up the Bottom using Gorilla super glue gel

NOTE:
From the original design around the circular base added layers to reinforce it.