Yep i think i misunderstood. I read TOR as TNSR.
In some cases you will be off the need to use routers also inside of your LAN network and pending on your network
topology and network Layer(s) it might be good to know
where exactly you should connect your TSNR router.
Although im still curious as to what switching
infrastructure is used.
It is pending on your network topology and/or network Layer design. as an example;
2 core switches (redundant) - Core Layer2
TOR Switch in each of the Racks - Distribution Layer
Access switches (stacked in ring) - Access Layer
This can be differing from design to design and also where
all these racks and/or switches will be installed. example:
IT Room (Server room) with Core Switches
on each stage of the building one rack with stacks and ToR
the stacks are connected to the ToR and the ToRs are connected to the Core switch(es)