Where is your proof?

They have thermal sensors on their forearms and are known to climb trees. Why wouldn't they approach from above?

https://www.cdc.gov/ticks/about/index.html

https://projectlyme.org/ticks-debunking-common-myths-and-mis...

Ticks climb low vegetation (not just grass) and wait for a host to pass by ("questing").

If you're going to disagree with basic textbook biology knowledge, the burden of proof is on you.