I believe the machine you have is a server with hardware RAID. As far as the OS is concerned, it sees the RAID arrays as a single disk each so you don’t have to do anything special to prepare them. It is sufficient to load the driver for the hardware RAID controller, and I believe that model has been around for a while and is well-supported in Linux.
I would assign the RAID1 to / and the RAID5 to /home. This can be done in the installer.