I'm looking to do a bit more optimizing of our network.

We have 2 switches and as you can see in the picture I want to utilize the 10G port on the switches as a backbone between the 2.
The Synology NAS (DSM6.3x) is connected as bonded (Adaptive load balancing). And I thought that IEEE 802.3ad Link aggregation would be better.
We might be looking to upgrade the NAS from 2 bay to something bigger / faster, or just larger drives some time this year. Or should we add more drives to the MS Server 2019 and run that as a NAS as well?

On the Draytek router i have the DHCP. It has a x.x.1.x for the main network. And a x.x.2.x for the airconditioning (Static IP).

The TP-link XE75 AP's have a wired backbone and run a guest SSID. Also on the main switch is the VOIP and some of the security cameras.

All the basic parts are on static IP's. The desktops / wifi clients are on DHCP.
There is a fair bit of data going between the clients on the 2 switches that i don't like having all that data crawling through the router. The router should only see the internet data.

My question here is on how to configure the switches, router, and NAS to work correctly. It's more than just rearanging the wires.
As it all works now we don't have any VLAN's configured. And I don't realy feel we would need that / more than just the 1.

I guess the guest wifi is on a different vlan or something as it shields the rest of the LAN from view.
It's my understanding that the 10G should be a trunk-ed connection? But how to set that up?

Could anyone help us out?