Make 3 ssd show as one on install

I have 3 SSD 2 2tb and one 256g. I would like to know how to make the show up as one on installation like fedora?

You can use LVM or setup the patitioning like this way, that the drives are mounted on certain folders/mount points.

Calamares does not work well with LVM - at least it is the general impression from forum topics on LVM