For almost twenty years, it's been understood that getting EVs started at existing dealers is going to be tough. In the US, anyway, dealers barely break even on new cars (they make more money on used cars, and the most money on service), so they are not interested in cars that they assume will be harder to sell, especially if they will cannibalize existing customers. And especially if they have to invest in equipment and training first. It will happen eventually (there ARE some enthusiastic dealers out there that are making great progress) but it will be slow. (This explains BMW's approach: make a sub-brand so dealers can opt in or out; and rather than create a cannibalizing volume car, create a mid-volume car (the i3) that combines compliance and conquest strategies, and a low-volume car (the i8) that follows the halo strategy. These don't cannibalize existing sales, but try to get more people in the showroom and bring in new customers. Meanwhile, make low-cost PHEVs options across the line; they aren't too scary that way).
Of course dealers will oppose any new competition, and automakers oppose any new business model that gives them less control. Automakers have been especially bad about assuming that EVs must be sold like gas cars: if you compare your product to another almost-commodity product, make sure YOU control the messaging, so you can emphasize your few benefits, and hope the customer doesn't notice your deficits. That's how they have done it for decades, and it is hard for them to adopt a new approach. This is largely why automakers resist allowing dealers to sell other types of vehicles (although in more rural areas they have to), and why they generally avoid multi-brand events unless THEY can bring the other brands' cars and be the ones talking about the differences. EVs sell differently; in this stage of a new market (though this will change too), sales of any brand helps all other brands, and there is more differentiation because the market isn't swamped with product yet. And consumers want more information because it is new tech, new user model, and expensive.
So, places that sell all types of EVs (and especially EVs exclusively) will likely do better at EV sales, but they are opposed by existing stakeholders (no surprise, that is true of almost any major industry change). That is not to say that some aren't giving it a shot anyway.
Here is a local used-EV outlet:
8th Street EV Outlet. They are new.
Here is a place in Los Angeles that "sells" new EVs, but it sounds like they really demonstrate them, and work with local dealers to make the sale:
Current EV Concierge Service.
Here is a place in Portland that is all about demonstrating EVs to the public, but doesn't do sales:
Electric Showcase