I imagine at Landsberg Prison.

I would have thought so too, however, The Landsberg Prison burial plot map from Thomas Raithel's "Die Strafanstalt Landsberg am Lech und der Spottiger Friedhof (1944-1958)" doesn't have anyone but Wolfram Sievers listed from the Doctor's Trial as being buried there. Family members could take the bodies and bury them elsewhere.