You might check for existing relays in their system.

This Robtex seems to have much of their network, which they appear to lease from other providers:

https://www.robtex.com/en/advisory/dns/cr/crservers/

And while they advertise many network blocks, it appears it's all slices of just a few large allocations:

http://www.cidr-report.org/cgi-bin/as-report?v=4&as=AS3790

http://www.cidr-report.org/cgi-bin/as-report?v=4&as=AS2385

You can download CSV of all relays from

https: // torstatus dot blutmagie dot de

and look for matches.

Otherwise, call or email them and ask how they feel about Tor exits. Hosting is competitive and if you run a relay with proper contact info and reverse DNS they might not mind. Ask them to automatically forward any complaints they receive to you.