Trying to acquire personal lines of credit

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Hi all, I'm planning to try getting as much available money in personal credit lines as I can to use for acquiring rentals. The plan would be to then cash out refi and repeat (BRRR) indefinitely without needing much, if any, of my own cash. I have excellent credit and a good income, so I'm hopeful I can accrue a good amount of available money this way. I'm planning to start applying for personal LOCs at as many local banks and credit unions as I can find, and hoping for the best. My question is, having never done this before and not wanting to badly hurt my credit with hard inquiries, is this a bad idea? I hear that if I have multiple hard inquiries in a short period of time for the same purpose, they can be considered as just one . Is this true? And if so, is there anything else I should be worried about with this plan? Thanks in advance.