This is doable. However, while the installation might be easier, your rig would now be tied down to the multiple drives, since the MBR would point to a bootloader on two separate drives. Thus, if you remove one of the drives (or sometimes, if you add a new drive), grub might not be able to pull up and give you your OS choices as originally desired.
Effectively, you'd have to retroactively "fix" the MBR and bootloaders, and get grub to update its directory if that happens. So technically, there is nothing stopping you (and yes, it might be considered cleaner) - but probably not the ideal route for a beginner, nor would it be encouraged unless you are ready to start debugging master boot records and bootloaders.