It depends on your requirements and the proposed work programme. I charge a daily fee, plus any travel and accommodation expenses if necessary.
I work from home in Orkney in a two hundred year old cottage beside the sea. While online conferencing is convenient and cost-effective, visitors are always welcome (Covid-permitting) and I travel to meet clients as required.
In Proposals I'm always happy to provide details of projects similar to yours, and contact details of people who can provide references.
As TTJ Tourism, Max and I were once asked to take frozen Arctic char from Cambridge Bay to Yellowknife while traveling between communities to help with tourism development in northern Canada. Naturally, we obliged.