If you want to keep costs down go for lc to lc connectors go straight into you sfp module you will need to buy and then you don t give the model of your netgear switches sfp into new or existing switch.
Connect a switch per floor.
Pick one of the switches to connect to the 1941 series router.
Plan the vlan scheme.
Include a management vlan possibly named management or native numbered to your.
For each of your port on your router will be connected to one floor.
Devise vlan names and numbers for the hr it and sales departments.
Assign one department to each switch.
If you can t afford 25k then get any two 24 48 port dell switches and put them on 14 and run 4 1gb copper 6a cables between the switches 2 per switch going to each switch on 17 and port channel then for 4gb throughput and redundancy in case a switch or cable dies.
Get 3 switch each floor should have its own small switch and all u need is 2 run on cable form on switch 2another then plug the computer into the switch on each floor also get 3 printer switch 1.
If you miss ports you buy a switch and you connect the switch always after the router.
The ada light switch height ranges refer to the recommended distance from the floor to the operable part of a light switch rather than the top or bottom of the cover usually the centerline for.
Or for wired solution one switch for each floor then good luck to wire each office or open space.
You have sfp slots on the 6048 switch.