What is the best way to organize the network and VLAN hierarchy?

Question

D-Link

Hello.
There is a small network of 70 hosts (computers, servers, printers, telephones and video cameras).
All this is in the same subnet on 3 D-link des-1210-28p switches connected one to the other.
As a Mikrotik hEX RB750Gr3 router (VPN via PTTP IPSEC for 2 remote sites, Internet with a backup LTE channel, web-proxy, the dude)
It is necessary to separate the network by VLAN (management, VOIP, cameras, printers, accounting, computers and servers).
The question is whether to put another D-Link DGS-1100-10 / ME switch and connect the existing switches with Mikrotik to it?
Is the RB750Gr3 enough power for the above tasks?
And will he cope if he just connects the existing D-links to Mikrotik?

Answer 1

On productivity - for "standard" office of productivity will suffice.
Well, if it's 70 high-load servers - count the load, look at the Mikrotik specs which one to take.
For switches - it's more correct to plug all the switches directly into the router. So the load will not hit the switch closest to the router in a chain of serially connected switches.

Answer 2

It is necessary to divide the network by VLAN (management, VOIP, cameras, printers, accounting, computers and servers).
The question is whether to put another D-Link DGS-1100-10 / ME switch and connect the existing switches with Mikrotik to it?
Is the RB750Gr3 enough power for the above tasks?

alas but no. The 750Gr3 itself has almost 2 gigabits of internal switching, which in fact can be 1 gigabit to each network. You need to look at a much more powerful device, for example 1100, it already holds 7.5 gigabits.
As another option, you buy normal switches and already do routing on them (L2 + / L3)

Answer 3

Of.site got blocked by Roskomnadzor? There is a sign there. On routing, this box will not let through more than a gigabit of traffic. Conclusion - not suitable.