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Just keep them close together and they'll only count as one inquiry. Some people say 14 days, others say 30. I kept all mine within 14 days of each other just to be sure
A single inquiry is like 3-12 points. Usually in the 3 or 4 range from my experience.
It's a time thing with the way credit report agencies calculate scores. Multiple inquiries for the same thing (like a mortgage) will all be considered as one inquiry if it's within a certain time frame.
On your report they'll show up as several inquiries but in the actual CRA's calculations they only count 1