Fundraising Support/Brokers - Success fees

What are the usual rates for companies/brokers supporting the fundraise? Since we targeted UHNWI and family offices in India as potential LP for our fund , we wanted to understand the potential investor base and got into contact with a M&A Broker via our network, which after some calls offered to compile a list and approach investors from his network. Whilst we asked, he did not disclose what his ask is in return and said he will think about it, maybe 1% of the raised money, we would be more of the idea to use them ask Backoffice and buys Side for DD. Does anyone has experience with intermediary and their fees?