If you use a lot of DT/DTM/DTP connectors, get a bunch of these:

https://www.prowireusa.com/content/5...-026-0205.webp

They're cheap, and with a single aluminum/aluminum 3/16" rivet can mount pretty much anywhere, and barely add any bulk to the connector. I've made small brackets off fuel rail mounts, epoxied them to valve covers, even used a tapped hole with a small button head allen to mount them. All for the exact reason you're describing, harness stress relief.

If you notice on an NB (my favorite factory wiring design of the NAs/NBs), the main harness is mounted in about half a dozen spots by the time it gets to the crank sensor plug.

 

Yeah, I think my next harness is going to be mounted to a lot more spots on the engine, and be as close to fully sealed/booted as I can with a combo of the rubber DT boots and Atum on the backside of OEM connectors. I do have my harness currently zip tied to hardlines and such as much as possible, but there's still a decent amount of branches just loose and hanging out.

 

Went to BW again, got a pb of 1:58.055 on the Aim, 1:58.056 on transponder timing. Zero changes to the car, on A052 that have like 10 days on them, ~50 deg F ambient temps