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In that location I would use some good quality double sided tape like gorilla and mount it more under the tube without the tie wrap if you want the clean look.
https://cpc.farnell.com/gorilla-tape/3044101/double-sided-mounting-tape-25mmx1/dp/SA03358?mckv=s5fjteh6F_dc|pcrid|224653346133|kword||match||plid||slid||product|SA03358|pgrid|50784644841|ptaid|pla-896721473021|&CMP=KNC-GUK-CPC-SHOPPING&gclid=EAIaIQobChMIws76pJOa6QIVhLTtCh1evAJwEAQYAiABEgLXd_D_BwEAnother option I have also used is a more decorated variety. I have one of these under my BB shell as a hidden easter egg for keen eyed mechanics. https://www.martysreliable.com/product/dirty-dog-skull-cable-guides-243087-1.htm
yafe
Haggis
Anyone had a similar issue and solved it with a better looking solution?