Hello a question about Stellarmate. Can Stellarium be installed in Stellarmate? Or you can install Stellarium in a PC and connect it remotely to Stellarmate (INDI telescope control)?
Stellarmate is linux distribution on a raspberry pi so you can install stellarium on it github.com/Stellarium/stellarium/wiki/Raspberry-Pi I haven't done it and I won't I think the raspberry pi isn't suitable to do heavy image rendering (see the caveat in the link I provided)
INDI/KStars on Raspberry Pi 4, 4gb
Raspbian Buster with AstroPi3 script configuration
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG/ASI120mm @280mm Guide Scope
PHD2
Waveshare Stepper Motor Board - DIY Focuser
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.