There are a bunch of options and they are probably dictated by your workshop space to some extent.
If you look at some of the videos of Spray.Bike users, many simply hang a frame by a wire or cord and move it around and deal with the potential obstacle of the string.
If you need it to be static for graphic application and such you can try either of these...
Park Tools (used to) make a really great tool that made gripping a frame in a stand quite easy but they've become a little expensive.
You can use something like this in your seat tube and then hold it in your stand.
Having a work stand that can articulate means you can flip and rotate the bike as you need to because of course, spray cans don't work at every angle.
There are a bunch of options and they are probably dictated by your workshop space to some extent.
If you look at some of the videos of Spray.Bike users, many simply hang a frame by a wire or cord and move it around and deal with the potential obstacle of the string.
If you need it to be static for graphic application and such you can try either of these...
Park Tools (used to) make a really great tool that made gripping a frame in a stand quite easy but they've become a little expensive.
You can use something like this in your seat tube and then hold it in your stand.
Having a work stand that can articulate means you can flip and rotate the bike as you need to because of course, spray cans don't work at every angle.