How should be a domain to buy?(I want to buy and old domain with high authority to make my PBN)

Hi guys
I need a domain with high domain authority for making my PBN.
I found a domain related to my niche (DA=29 and spam score=32) whit a good number of referring domains and back links.
I have doubts about two things:
1. The spam score that seems a little high (is it going to make problem?)
2. This website is a single page site. I want to know if I'll have problems in promoting its SEO.
I'll be appreciate if you can help me with your guides

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