Simple stand for model of Millenium Falcon created by GOODESIGN from website Fab365. 
https://fab365.net/items/277 stand is 115 mm tall and useable for rear left pocket for landing gear. Model is rotated 5 degrees down in front direction and 25 degrees to the right. I share step file so you can update your model as you want.

UPDATE 16.12.2021 - I added slightly bigger version 2 (0.2 mm + in length and width in connection area) so stand should fit more tight in Millenium Falcon, it may happen that it will be too much for your model, then I recommend grind it a bit :)