The Generac surge protector is a Generac branded Eaton SP-1 surge protection device. The 2020 NEC in Article 230.67 requires that all one- and two-family dwelling units have a surge protective device installed at the service equipment or first downstream distribution panelboard. This is why Generac teamed up with Eaton to provide these devices. The SPD can be installed as a Type 1 or Type 2 SPD. The Eaton SP-1 is a far superior SPD than the "Mike Holmes" Eaton CHSP series devices.
EATON still calls the SP-1 a CHSP series product. I'm a novice to the specs, which difference makes the SP-1 'far superior'. I don't doubt it's better, it's more than 4 times more money than the EATON model Mike Holmes endorses so that logic would support better. Is it better because of a Type 1 install or the specs? It's too much of a pain for me to go the Type 1 route at this point, and the price for that surge protector is pretty steep.