30" S8 - where to mount relay

I will be installing a BD S8 30" in the lower grill using the BD wiring harness, and have read many threads on the topic but never saw a pic for where the relay gets mounted inside the engine bay. For those that have installed it, where are you mounting the relay (which is near the battery hookup cables. I've seen a pic of the tacoma where they put it a couple inches away from a bolt that has some grounding wires. Not sure if the place they mounted it to was a newly added bolt or an oem existing one. Do I use a self tapping screw to just mount it near that point, on the engine bay side wall? Clear as mud or do I need to get a pic to better explain?

 

just mounted based on pics seen in other photos using a metal tap screw