There's a considerable amount of wealth in Amherst/Hollis/Nashua/Merrimack not to mention plenty within a 25-30 minute drive of Amherst. That wouldn't be a bad spot at all.
(Hopefully their real estate people are stalking this thread)
Here's a not too subtle nudge using Google maps. That would be (603) 434-6700!
Notwithstanding the fact we all bring our own geographical bias to Tesla's decisions, any location in southern NH would have to add consideration for our friends in VT. At least one VT owner (probably many) are advocates for service in NH. Knowing they are unlikely to see a service center sooner than NH, any reduction in the long drive would be a benefit.
It's probably the ONLY good spot on NH-101A (Amherst St) since it has access right from Exit 8. Going further out (west) means even more traffic lights and Amherst Street is NOT a fun place to be in rush hour.
Now, there's a great pad spot in Hudson (was supposed to be developed but never was), right off the highway that would have minimal traffic and I could WALK there
If you're referencing the property across from the highway exit, I'm pretty sure it's owned by the state DOT. They've been sitting on it for years. That's part of the land reserved for the partially developed circumferential highway. The proposed completed highway gets periodically revived, designed to alleviate traffic on Lowell Rd. and to add another bridge over to RT 3 between Nashua and Manchester. Wonder if they'll ever give it up? Large issue with wetlands towards the east, also costs and eminent domain hassles, they might as well throw in the towel!
Notice driving off the highway and heading north on Lowell Rd., maybe a quarter mile past the Subaru dealer, there's a open plot on the left that's been available for years.