This is what I have and it's multi purpose. It sits on the platter for headshell alignment and also is a level for the tonearm given that your decks are truly level. https://www.amazon.com/gp/product/B005KR15HU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

This is the level to make sure your deck is actually level. https://www.amazon.com/Viborg-Stabilizer-Aluminum-Turntable-Protective/dp/B07F9HPF8D/ref=redir_mobile_desktop?ie=UTF8&aaxitk=Ew5CwAIJv9Nx.ro0Z1pLWw&hsa_cr_id=7298234700901&ref_=sb_s_sparkle