Setup Two Node Red Hat Cluster without shared storage

Hi,

We have plan to build a high availability critical application production, we need a suggestion and best practice to implement high availability server using red hat. Let say there are two node servers (two rack servers) connected each other thru network switch using their dedicated interfaces (for example, eth0 for ip data, eth1 for ip private cluster heartbeat) and these servers don't have a connection to SAN/NAS Storage so these servers just using their internal disks. Then our application team need to make their application active-standby that remain inside internal disk server (for example the mount point is /apps in internal disk). How to make this mount point sync to another node so that if node one went down, the node two will take the service of the application going up ? is that correct that we need to build red hat cluster under this circumstances ? what is the method of failover when one server down ?
if we need the licenses of high availability servers, what kind license subscription do we need ?

Hereby attachment picture of sample high availability topology.

Thanks in advance.

Regards,
Aldi