Cemetery Location

I’m on a mission to find the burial spot of my GG Grandparents, Adam and Anna E Merritt (Rush). They’re buried in Saint John’s Cemetery, also known as German Evangelical Lutheran Cemetery. It’s located in Ayers Township or Broadlands, Champaign, Illinois. I’ve checked out FS cemetery, Find a Grave, and Billion Graves, but unfortunately, none of them have any results. I do have a headstone photo from a few years back, and I’d love to double-check if it matches the cemetery. Any help you can give me in locating the cemetery would be amazing! Thanks a bunch for your assistance, Bill