That space may be a bit challenging with only six traps. For any single room studio, there are two "listening" locations that the treatment should be focused: (i) wherever the mics and guitar are located and (ii) wherever your playback speakers and your ears are located. Your angled wall has advantages and disadvantages, and it's probably best to place several traps on it, as well as the corners of the main vertical walls. Yes, some portable gobo traps will help too.
In terms of placement, try placing you recording desk facing the wide wall towards the angled ceiling but pull it out a bit from that wall. Try the mics a few feet behind the desk chair pointing towards the desk and simply turn the chair around to record.
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