OCEANPAX 8.47 X 6.3 Inch Cat Scat Mat with Plastic Spikes Cat Deterrent Mats Scat Mat for Cats Pest Prickle Strips from Digging 12 Pack Include 6 Staples and 6 Zip Ties https://www.amazon.com/dp/B086L2H4TX/ref=cm_sw_r_cp_api_glt_fabc_ESDQDRDF4H1503K4H66G plastic spikes works perfect for me
Invest in these: OCEANPAX 8.47 X 6.3 Inch Cat Scat Mat with Plastic Spikes Cat Deterrent Mats Scat Mat for Cats Pest Prickle Strips from Digging 12 Pack Include 6 Staples and 6 Zip Ties https://www.amazon.com/dp/B086L2H4TX/ref=cm_sw_r_cp_api_glt_fabc_D65Y1RY7B0EYWS5PPNSJ
They are amazing
Maybe before bird spikes, try cat spikes. More uncomfortable than anything. https://www.amazon.com/dp/B086L2H4TX