I think recent versions of advance mame have superior support (rawinput) for using dual lightguns. They also look for either smogs driver (guncon) or actlabs. However, I do not know if they are looking for tv or pc versions or both.
While pc guns were not designed like the tv ones for dual support, dual pc ones have definately been seen and used working. Not sure what the requirements are.
NB you can use advancemame without all the clever graphics drivers if you want.