the best solution for older home is using wall mounted pedestal for your turntable, it will also buy you some space on your audio cabinet / shelf
Google results, https://www.google.com/search?q=turntable+isolation+wall+mount&rlz=1C1CHBF_enUS730US730&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiA-euMx4zjAhXMZc0KHSoZD3IQ_AUIESgC&biw=1920&bih=1089
Google results, https://www.google.com/search?q=turntable+isolation+wall+mount&rlz=1C1CHBF_enUS730US730&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiA-euMx4zjAhXMZc0KHSoZD3IQ_AUIESgC&biw=1920&bih=1089