I’ve been having lessons through Zoom on my iPhone for about a year now. I use AirPods and personally wear both since I’m at a quiet, private barn. I just use a flexi tripod to fasten my phone to the arena gate and try to get as much of the arena as possible in the shot.
There are a couple of blind spots this way but I just ensure that if we’re working on something specific (like a transition) that I place it where my coach can see it.
There is no delay as long as my coach doesn’t have her video camera on (which means she can see me but I can’t see her) and with the earbuds it’s almost nicer than in person since no one needs to yell.
It’s definitely a low tech way to do it but I don’t have anyone willing to give up an hour to video me on a regular basis and because my barn is way out in the country the signal isn’t good enough for the Pivo to work.