Connecting 1 Router with 2 x 48 ports switches for 60 x VLANs

[Radintal]

Please advise on the best architecture for the following network scenario:

60 Shared Offices in one building with 2 sides
Each office separate isolated network (VLAN) with dedicated DHCP segment.
2 x ZyXel GS2210-48 Layer 2 48 ports switches
4 Internet lines load balanced with 1 x ZyWall USG310 with 8 configurable ports.

What is the best practice:
1. Connect each switch directly to the router USG310
or
2. Connect Slave switch to Master switch with single or aggregated 2-3 ports of 1GB each.
Then Master switch with 1GB to a single port on ZyWall USG310

There will be no traffic between offices i.e. on the LAN.
All traffic will be towards internet with equal bandwidth supply.

 

[dave_the_nerd]

Since the router has multiple downstream ports, it's probably better to configure half the VLANs on each switch and have them separate.

Since you're just using these for internet traffic, there's no real point to link aggregation, although you might want to connect them in pairs just for failover purposes.

 

[Radintal]

Thanks Dave for advise!
Obviously, in this case no port aggregation is needed, as each switch will be connected directly to router.
I meant to do it only if I need to achieve better up-link between the switches.
I just need now to figure out how to divide VLANs on the USG310 and sync to GS2210 correctly.