LTM support multiple SAN certs on single virtual server

Unfortunately a single LTM client SSL profile can't specify multiple server name (SNI) values, and an SNI client SSL profile is "selected" based on the Server Name attribute in the profile. What you can do is define a separate client SSL profile for each SAN value (plus the CN if different) and apply all of those to the LTM VIP. So for your example:

SAN cert 1 would create two client SSL profiles, each with a different Server Name value (abc.com and cde.com). SAN cert 2 would create two separate client SSL profiles. Apply all four SSL profiles to the VIP.