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There are various trunking methods for cables - cheap and tidy too.
D-Line EU/1D3015W/EH Mini Trunking, Electrical Cable Management Solution, Self-Adhesive Cord Cover - 30mm (W) x 15mm (H) - White (1-Meter Length) https://www.amazon.co.uk/dp/B00TJQ882S/ref=cm_sw_r_cp_api_fabc_SJB48WRCCN4Z2Z1K86KP
There are also self adhesive clips which I have used and are good.
Cable clips should work if you are careful. -
You'll struggle, render has more cement than mortar and is hard as fuck usually. On the plus side, because of this added strength, hopefully it won't crumble away if you do manage to get a nail into it.
This is all reliant on the render being in good nick/still bonded to the substrate tho.
This guy has all the answers it seems. And agrees that you may struggle to get clips into render.
https://www.youtube.com/watch?v=I2C-g8H8PT4
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I needed to do this into brick (indoor) and really struggled.
In the end I used some of that super-doober strong adhesive that comes in a mastic-style tube. It worked.
Luckily for me it's in the outhouse, walls are white and glue is white - so doesn't need to look good. But if there are two of you and you can work out how to pin the cable straight during the process I think it can be done neatly.
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TGR
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@Hovis
Can I hammer cable clips into a rendered wall / is there a risk of it dislodging large chunks and falling off? I need to secure a flappy TV aerial able.