old COD MW2/BO2 Zombies LAN setup?

how can i setup mw2 lan play in 2026 nowadays with laptops while avoiding desync?

ok so me and 2 of my friends wanna play some mw2 on lan play,tho when we tried setting it up,using some youtube guides,we had some desync issues(where some shots wouldnt register on the other players)

so any ideas on how we can fix that?entirely new to lan play stuff as we mostly used with the usual split screen gaming on the xbox360/ps4 days

for reference the laptops dont have ethernet ports so we only use a portable router(mifi) and all of them are i5 8th-10th gen laptops with 16gb ram except one that uses 8gb ram