Nexus mods isn't shady, they inform user regarding data breach. They provide mods and have been serving mods ever since pre 2010 I believe (registered myself on that site back in 2014 ish).
Maybe slightly off-topic, I recommend to use Viva New Vegas guide as based on my testing the game is more stable and suitable base for modding up your New Vegas install, however also check out every mods you are going to install especially older mods pre-2018 (for me) as they sometime aren't optimized which may makes unstable issue with the game. Hope you enjoy the New Vegas!