Here's guaranteed to work memory

https://www.crucial.com/compatible-upgrade-for/dell/xps-15-(9500)

For anything else, check with your supplier or the manufacturer.

I would be very careful with high performance RAM - it's not uncommon for such RAM to require adjustable settings in UEFI Setup that your XPS system does not provide.

Down to 3 options:  Which of the 3 is more reliable company and memory? 

Option 1:  Kingston Technology HyperX Impact  32GB 2933MHz DDR4 CL17 SODIMM (Kit of 2) Memory HX429S17IBK2/32

https://www.amazon.com/gp/product/B07BGLBZBK/ref=ox_sc_act_title_1?smid=ATVPDKIKX0DER&th=1

Option 2:  Corsair Vengeance Performance Memory Kit 32GB DDR4 2666MHz CL18 Unbuffered SODIMM, (2 x 16GB) (CMSX32GX4M2A2666C18)

https://www.amazon.com/dp/B01BGZEVHU/?coliid=IP48SWTFHSDU5&colid=3AAJDQ0P1JKE0&psc=1&ref_=lv_ov_lig_dp_it

Option 3: Crucial 32GB Kit (16GB x 2) DDR4 2666 MT/s (PC4-21300) SODIMM 260-Pin Memory - CT2K16G4SFRA266

https://www.amazon.com/Crucial-16GBx2-PC4-21300-SODIMM-260-Pin/dp/B08C4X3F3S?th=1

personally I would choose the crucial ram...

And if you want Kingston RAM, HyperX is not what Kingston recommends.  This is.

https://www.kingston.com/unitedstates/us/memory/search?model=101273&devicetype=3&mfr=DEL&line=XPS

For those who are considering memory upgrade.

Today I've installed into my Dell XPS 15 9500 i7 10750H two modules of HyperX Impact 16GB DDR4 SODIMM PC4-23400 HX429S17IB2/16 and can confirm that they work with a desired clock (>2900) and timings. See screenshots: