My only concern was he brought up
good detail for the cashier area
which lead me to thinking a simple fisheye will be insufficient. In my experience with fisheyes, they are really effective at overview of small to medium sized areas, but they are not well suited for details like cash transactions or large, poorly lit areas.
Another way to address this would be one fisheye for overview, and then one camera over the register. This would cost less than the multi-imager, but it would also be two devices to configure, maintain, and log into to retrieve footage, if using edge recording.
The simplicity of the multi-imager would be my choice, if it were my shop. However, it isn't my shop, so the EU#1 is free to choose as he likes.