6 nines is really really difficult. It’s hard to estimate costs with specific requirements, but a marketplace site with 1000 daily users means you’re expecting about 1 user per minute, which isn’t a lot. I’d imagine you could get by with the cheapest cloud hosting.
The real problem is that most major cloud providers don’t offer 6 nines. Even AWS only offers credits below 99.5%, so you’d want to not lock yourself into a single provider. My best suggestion is to have a small/cheap server with all of the big names and load balance/round robin between them.
I hate Tesla and traded mine in after only two months of ownership, but in no way is the lever hidden or not extremely obvious. In fact it is more obvious than the button. Several times I had passengers try to use the manual lever, which doesn't lower the window when used. After the second person did it, moving forward I told every person who hadn't been in my car before to use the button before getting out. Was one of the many reasons I traded it in.