I actually have both GE and Zooz In this case it was GE 3-way switch. I did figure it out though after a lot of research (and this thread) helped me build the confidence! I think my situation was extra weird because it was a ceiling fan light.
I was able to scavenge a neutral from a switch exactly opposite the load 3-way switch on the same circuit (I have seen that doing this from a DIFFERENT circuit would be dangerous, which makes sense!) This left me with the actual wiring confusion. The red wire on the load switch was wired to common instead of a black wire. From the same bundle, a white taped over with black and a black acted as the travelers. Interesting.
I found that on the line side (2 switch side) that the red came out of that 3-wire+ground bundle and was wired directly up to another bundle! I determined this must be because the ceiling fan wiring heads up from that location, necessitating the load wire to come all the way back from the load switch to the line location, then connect to the ceiling fan (red to red.)
This meant my white/black tape and black wires were actually acting as my travelers. I just picked one to use as the low voltage signal traveler on the switch, and the other went into the line switch’s “load” port - and was connected at the load switch location to the red load wire via wire nut (like the GE instructions say, but different color in my case!)
It was imporant to look at how many wire bundles were coming in to each switch location and figure out what they do, and then try not to get confused by the wire color differences over and over every time I looked at another example. Working great now!!
Had I not had a nearby neutral to tap into I would have been totally SOL though. Really lucked out! I see you might have some switches that don’t require a neutral in both spots, which would have been handy. I have had 2 GE switches fail so far… luckily they have replaced both. Hoping my Zooz has better luck (it is controlling my ceiling fan.)