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I suspect NH-L9i is going to have a tough time to handle 8700K.  It is a hot CPU.  Delidding will help, and possibly undervolting.

You might want to go to the thread below and see what other people will say:-

https://smallformfactor.net/forum/threads/8700k-noctua-nh-l9i-what-are-your-temps.6811/#post-86861


NH-L9i, according to Noctua, is designed for 65W TDP CPU only.  8700K is 95W and is listed with a red 'X' as not recommended.

https://noctua.at/en/nh_l9i_tdp_guidelines


Two alternatives to consider:-

a) Silverstone AR06

It has four 6mm heatpipes (vs two of the NH-L9i) and is rated at 95W TDP.  It runs a 92mm thin fan.


b) ID Cooling IS-60

This has six 6mm heatpipes and runs a 120mm thin fan.  This is probably a better guy to handle an 8700K, after changing the stock fan to a more powerful Noctua fan.