A nice big Threadripper in the corner of your office is all you need, I can almost certainly guarantee it. There are very very few businesses with less than 1000 employees that can't be run on one modern high end server.
It's not that most CRUD apps could run on a single machine, it's that they probably shouldn't. Customers want redundancy, automated failover, etc. Datacenters are much better at offering these things than your office park.
Are people spilling coffee on your servers at work?
- No one can see your code
- No one can shut you down