How to design network with high availability in a multilevel small workplace [on hold]

I want to create a network in my work 4 floors 50m2*4 workplace. Requirements are simple:

  1. Share internet ( < 20mb/s ADSL) while blocking someone from abusing download speed for long period. (Throttle him if he downloads continuously for 5mins+ !)
  2. WiFi coverage to 3 floors 60m2
  3. Allow all devices to access local servers (2 ubuntu servers 1 running the web server and other git servers)

I have no experience in networks and I googled and found many solutions.

First, the problem encountered while planning for such low traffic network is should I use 1. Business grade 2. Consumer grade products ??

Is it worth the huge price difference? Do I have to buy a network controller? If all I need is a single TCP/IP network?

What I have in mind?

  1. Poe router
  2. Poe switch 8ports * 3
  3. Poe access point 2 on each floor (6)

I was thinking I can take 1 cat6 cable from the router into a switch. Then take a cable into my 2 servers and 1 to a switch in a floor above it.

Take 2 cables from the 2nd-floor switch into my 2 access point in that floor and one cable to floor above. And so on until I cover all floors.

The network will be used by around 20-40 device most traffic is HTTP web traffic for our local server (git server & web server both internal)

Can someone tell me if I'm thinking straight or not?

When so you chose to use a switch on each level, vs single 28port switch on the first floor?

Since I will still do all civil work anyway, is Poe worth it? Or I should save and just take a power cable to run along with all cat6 ducts from floor 1 upward?

If I ever decided to use phones or cameras on this network would it work or there are things to consider first?

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