Box art is supported by Robospin and I'm sure the same goes for Nevato. All you have to do is edit your AM emulator config in question and point the flyer path to box art media instead of flyer media.
FYI, I'm going to release robospin.v4 tomorrow that has some new features, cosmetic changes, and some tweaks. Here are some of the highlights:
Fixed a scaling issue that broke on odroid.
Added new console backgrounds with a blur effect that get loaded when you switch to a different emulator.
Tweaked spin wheel to display less wheel art for better spacing and performance.
Changed the text frame and moved it to the bottom of the display like the original robospin, more room for listbox if enabled and looks better
Tweaked snap skew and pinch effects for better scaling, looks much better from 640 to 1080.
Adjusted flyer placement again, flyer is no longer rotated and is now full height and half width on right side of cabinet.
Some text enhancements.
Scanline effect for bg can be turned off now.
Some other minor changes.