1.5U Rack Mount Stand for Intel NUC 11 Version NUC5I3RYK with 6 Keystone Support
and cable fixing
on the side there are 2 holes for Brass Insert Knurled Nut ( https://it.aliexpress.com/item/1005002870937546.html?spm=a2g0o.order_list.order_list_main.80.6cae3696NtwMG8&gatewayAdapt=glo2ita )

Also compatible with i3 and i5 versions

You will find other modular accessories in my profile such as side stand or other rack supports for Intel Nuc

Rackmount Lateral Support: https://makerworld.com/en/models/512585#profileId-428656