Use the Di2 adhesive strips instead of tape, they work really well! https://www.bikeinn.com/bike/shimano-di2-cable-guide/135997400/p
Yeah I had looked at them, CRC have some in stock. Reviews seemed mixed so I wasn't sure how well they stayed stuck.
If the frame is nice and clean before hand then they stick really well. I used them for cable routing up the fork leg but on my commuter that gets ridden in all weathers and they haven’t come unstuck in over a year and look cleaner than tape.
@Saffronspokes started
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Use the Di2 adhesive strips instead of tape, they work really well!
https://www.bikeinn.com/bike/shimano-di2-cable-guide/135997400/p