WAF behind Internal Load Balancer in Azure

Hello team ,

I have a query related to WAF

We have a VNET in Azure

There are two entries from the Internet - one is Internet facing firewall which is checkpoint cluster for all north-south traffic . There is an Azure Load Balancer external in front of it

The other entry is via SRX also internet facing where all our VPN tunnels(from on prem sites) will be terminating

Question is can we use a common Internal Load Balancer for both these firewalls

and then place a F5 WAF after the common Internal Load Balancer .

or cant we directly use F5 WAF as Internal Load Balancer instead of using Azure Internal LB