If You are going to really isolate any possible wiring harness damage from rubbing on anything, then this is the best way period.
This process takes a little more time and good quality wire ties.
No China Crap. The whole pack I got from HomeDepot is China Junk.
This wasted several hours right from the start, until I noticed they were falling off for no reason.
Put my reading glasses on and sure enough, China got me like a sharp poke in the eye.
On aircraft as a standard when we remanufacture them, it's done the same at any single attachment point.
You need 3 wire ties for each point of attachment.
Never bind harness directly to a frame member.
Use one wire tie on harness - keep it loose.
Use one wire tie at frame or other fixing point - keep it loose.
Now the 3rd wire tie is used to connect the other 2.
It's tucked under the other 2
Snug up the other 2 on the 3rd.
The 3rd one can be left anywhere from snug, to 1 inch diameter.
The larger the better. This 3rd one is now the suspension point.
This keeps the harness flexible, but in no way can make contact to the rigid frame member, or touch other objects.
There are also wire ties with screw eye attachment point for the primary point.
If your into the area often to make modifications, then you only need to cut the 3rd wire tie, and replace it.
Also - there is no limit to the number of ties used at any point.
You can create your own safety factor as you like.
As an optional wire tie on the harness, use the velcro straps.
On any harness, use only enough grip pressure to where it doesn't slide, but doesn't crush either.
>> This 3 point process can be applied at any point, 2 or more points come into contact with anything. Hoses, Vacuum lines, etc.
Provide heat shielding where necessary any where around exhaust. If you can bake bread there, You get the idea.
Although a spot to put canned soup or a baked potato could be handy.
Inspections of aircraft, I have found improper wire tied applications actually wore into the chrome molly engine mount frames of single engine type. Dealing with lives in flight, you will become detailed.