The part snap together like puzzle parts. It works as a snapfit.

The channels are made for the classic 6mm wide neon led strips. Just cut them to site and solder them together in a row. Between the led strips, use a thin cable, that you run inside of the channel unter the led strip. Everything holds in place without glue. If you want to attach it to the wall, just drill small holes at your desired locations and screw it to the wall.

Neon LED strips:

https://www.amazon.com/dp/B08SJHFY3X?psc=1&ref=ppx_yo2ov_dt_b_product_details

Cables between the strips:

https://de.aliexpress.com/item/1005003707139369.html?src=google&src=google&albch=shopping&acnt=272-267-0231&slnk=&plac=&mtctp=&albbt=Google_7_shopping&gclsrc=aw.ds&albagn=888888&ds_e_adid=&ds_e_matchtype=&ds_e_device=c&ds_e_network=x&ds_e_product_group_id=&ds_e_product_id=de1005003707139369&ds_e_product_merchant_id=107910649&ds_e_product_country=DE&ds_e_product_language=de&ds_e_product_channel=online&ds_e_product_store_id=&ds_url_v=2&albcp=20701456946&albag=&isSmbAutoCall=false&needSmbHouyi=false&gad_source=1&gclid=CjwKCAiAopuvBhBCEiwAm8jaMUciAlfWak-YeTDx7nOU3wOWIPS1ZVAX6EvbHIijspnayLuUBiDCFRoCovUQAvD_BwE&aff_fcid=107cade952a047248f24981fc2fa9b06-1709634805177-03747-UneMJZVf&aff_fsk=UneMJZVf&aff_platform=aaf&sk=UneMJZVf&aff_trace_key=107cade952a047248f24981fc2fa9b06-1709634805177-03747-UneMJZVf&terminal_id=1053963c6e8c46b28928753d5d9eb3ac&afSmartRedirect=y

Power Supply:

https://www.amazon.com/dp/B00FEOB4EI?psc=1&ref=ppx_yo2ov_dt_b_product_details

Cable for attachement:

https://www.amazon.com/dp/B01GPQZ4EE?psc=1&ref=ppx_yo2ov_dt_b_product_details

Switch:

https://www.amazon.com/dp/B0895NVJLF?psc=1&ref=ppx_yo2ov_dt_b_product_details

Dimmable switch:

https://www.amazon.com/gp/product/B07KW4NCCJ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1