Intermatic AG3000 120/240 VAC Universal HVAC Surge Protective Device - Advanced Surge Protection, TPMOV Tech, Watertight Enclosure - UL Listed for Reliable Safety

Both and all. True surge protection is multi stage. A lot of surge damage can come from inside your house. It’s not always an outside threat. https://www.esfi.org/surge-protection-keeping-your-electronics-and-home-safe/ Meaning you can do the whole house surge at the panel. You can use point of use protection at specific equipment, like the central air condenser or heat pump. You can install surge protection outlets at locations for media centers or gaming desks. Use another surge protector plugged into that with a UPS with built-in line filtering and surge protection that safeguards electronics from power outages, voltage fluctuations, and electromagnetic noise. All depends how important your equipment is to you. I used this https://a.co/d/000h56nZ to protect my brand new central air unit. I use these https://a.co/d/04CBZSho for my TVs and computers. All in addition to the whole house device on my panel.