If you have 5 office buildings with 50-500-500-500-2000 people in them (respectively), then standardising is probably a good idea since now you can use the same company to fix problems in all the builds and not have to take special care with the small building.
However. If you have 30 builds with 5 people in each. Sending a new, preconfigure, router by fedex is so much cheaper.
That is how my phone company treats me. If my home router dies, or has an odd problem that they can't figure. They just send me a new router by mail and I switch it out with the old one and send that one back.
What's the price? Not a lot.
We are state employees, and as such, are paid state employee wages. I am compensated for mileage, but beyond that, there is no charge to the individual districts. Part of the cost of these routers was a 4 year Cisco Smart Care plan which replaces the hardware within 24 hours at no additional cost. What that really means is, they ship it to me and it's my responsibility to replace and return the failed part. Much of what I do is remote configuration changes and very little on-site time.
Everyone in this deal should be advising as though they are spending their own money. You can spend a lot of money, but would you if it were you own and you had other things to consider in a budget?
It's reasonable for an enterprise deployment to try to standardize on some components, which costs something in size-inefficiency. It's ok to spec a 2-5x bigger product for some sites if most other sites are bigger, and if the big/small products are wildly different, etc. But that's clearly not the case here.
Arguably the state should have had in-house competence to spend money on the taxpayer's behalf, or should have engaged a contractor with fiduciary responsibility to design/spec the work (and excluded from bidding).
In other words: if there's no incentive, what difference does it make?
Next task: make the case standardizing on Ferrari 599s for all government vehicles. All of you arguments will hold in that cases as well.