Remote is too hard for lab settings usually. Professors / RAs are neurotic people and need "butts in seats". Moreover, sending US grant money to Mexico is often really hard (I've tried). The exception is if you know someone who can work some angles.

Try messing with scientific datasets and publishing a blog and seeing if you can replicate results or find new ones. If you can do that fluidly - you'll be a shoe-in for that type of work.