It's not trying to store QuickBox in those locations... that is the mount point for your quotas on a given partition. If you have a /home mounted partition... you opt for number 2. The results of
lsblk will show you which mount point to use and the script does this on install.
In the beginning of the script before it ask you to continue, you see output such as this:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 10G 0 disk
├─sda1 8:1 0 9G 0 part /
├─sda2 8:2 0 1K 0 part
└─sda5 8:5 0 1022M 0 part [SWAP]
sr0 11:0 1 1024M 0 rom
Typically, on the point with the most space assigned is the one you should select.