That's a bit of a red flag for an incompetent shop. The Tesla parts from MPP make it actually a lot easier to do an alignment. The other problem is that you're still going to have your aftermarket upper control arms which is the only way to adjust front camber. The only adjustable things on a stock Tesla suspension model 3 are toe and if you move the front mounting of the top hat and front assembly you can get some modest 1/3 of a degree or so change. Yes the eccentric cam mechanism is the only way on a stock Tesla to adjust rear toe but it's a beast to get or set subtle toe changes with that thing. Plus over time it tends to rust and it becomes even harder to work with. These issues for sure are part of why MPP has sold a gazillion rear toe arms.
I'd discuss all this with them and make it clear that it's way easier to adjust particularly toe at the rear with the aftermarket arms. If they dig in their heels and refuse to listen to reason, I might think about trying to find another shop. Perhaps Mountain Pass has a list of local installers that might also do alignment? Alternatively, you can adjust toe in pretty easily yourself and toe problems much more than camber problems are why people chew up tires. I was going to post a review of some toe plates with some very easy ways of doing front and rear toe in.
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