Covid positive upon departure

https://mx.usembassy.gov/covid-19-information-for-u-s-citizens-in-mexico/

https://www.traveloffpath.com/what-to-do-if-you-test-positive-while-on-vacation-in-mexico/

If your a US Citizen read the first one.
If your not? You should check with your countries policy.

Mexico, does not have designated hotels. It is up to the individual to self quarantine. If you can find or hear about an offical Mexico Rule/Advisory/policy/procedure other than Self Quarantine, PLEASE POST IT.