LTM HA L3 not L2 connectivity

the K article on askf5 points out some best practices

https://support.f5.com/csp/article/K14135

as for your external and internal there is less need for L2 connectivity, but you do have to work out the rest of your routing.

while active / active always sounds nice, it does become more complex and if you load above 50% you kinda lose redundancy.