A wire floored brooder is fine. I raise from hundreds to thousands of chickens, ducks, geese, turkeys and such each year - all in outdoor brooders with a hardware cloth floor. Sometimes I'll put some paper towels over part of the floor for the first few days, sometimes I don't. They all turn out fine.
You can see pictures of one of our brooders on the link in my signature below.

You can see pictures of one of our brooders on the link in my signature below.
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