Location of Proximity Sensors?

Hello all,

I have a total of 8 proximity sensors that were shipped with the latest version of the Predator series.

However, there are only 2 clearly defined locations on the gantry arms for proximity sensors.

On the raptor kits that I could find online, there are milled slots along the X and Z axis where these proximity sensors go, but on my kit, there aren't any locations on the profiles.

Can someone give me a general idea on where they should go so that I can proximate a location and drill the profiles to mount them?

Thanks