LTM Placement in a network

Well the most common and ideal design should be:

Logical flow should be:

Firewall >> LTM >> Switches >> Server farm

Physical Placement

Firewall connected to switch

LTM connected to same switch (with default GW as firewall)

Remaining ports on the switches will carry your Server VLANs (and additional switches is required)

Your servers may or may not have LTMs as a default gw depends on the requirement (if not you can always use SNAT automap)

-Ajmal