I no!! Haha sorry my mistake. Only after seeing the image did I remember that the BIOS folder is actually in the same folder as the pcsx folder. So you actually got the BIOS folder correct to begin with!
After that you can select the bios in PCSX.
SORRY ABOUT THE CONFUSION!
That said, the BIOS directory is indirectly determined by where the .pcsx directory is located.
On a side note, since you’re using my custom community image anyway, check the first post in the thread for instruction on where to put other files etc. it’s under the “post installation” section near the bottom.