I've kept my J1772 adapter in the center console where it is not very secure (even though I merely have Insane acceleration). Because of this thread, I went out and checked my glove box. There's no "J1772 holder" per se, but there are two recessed areas in the very back of the glove box, one on the bottom left and one on the bottom right, that fit the J1772 adapter just right. So I'm going to try it out there.
I, too, like to opportunity charge when I can and am usually able to cobble together a decent charge because of the ubiquity of J1772-based free chargers in my town. I was just at a brewery today playing outside with my kids and got about +50 miles range. In case that sounds weird, most of the breweries here in Asheville are kid-friendly and serve as social hubs for families, usually featuring playgrounds, kids activities, and lots of outdoor space for playing (one even has a weekly story time for kids - Archetype Brewing). And often level 2 chargers with J1772 plugs! Kids under 10 easily outnumbered adults today.