Here are some touchpad keyboards that are compatible with Surface Pro 7+/7/6/5/4/3:

• Microsoft Surface Pro Signature Type Cover is a premium keyboard that is made of Alcantara material. It has a full-size keyboard with backlit keys and a large touchpad. The keyboard also has a built-in fingerprint sensor for Windows Hello authentication. 
• Logitech K480 is a versatile keyboard that can be used with a variety of devices, including Surface Pro. It has a compact design and a detachable touchpad. The keyboard also has a built-in stand that can be used to prop up your Surface Pro. 
• Inateck Surface Pro Keyboard is a budget-friendly keyboard that is compatible with Surface Pro. It has a full-size keyboard with backlit keys and a touchpad. The keyboard also has a kickstand that can be used to prop up your Surface Pro. 
• COO Surface Pro 7 Case with Keyboard is a case that comes with a built-in keyboard. The case is made of durable materials and it protects your Surface Pro from bumps and scratches. The keyboard is full-size and it has backlit keys. 
• Microsoft Designer Compact Keyboard is a slim and portable keyboard that is compatible with Surface Pro. It has a full-size keyboard with backlit keys and a touchpad. The keyboard also has a built-in kickstand that can be used to prop up your Surface Pro. 

When choosing a touchpad keyboard for your Surface Pro, you should consider the following factors:

• Compatibility: Make sure that the keyboard is compatible with your Surface Pro model.
• Features: Consider the features that are important to you, such as backlit keys, a touchpad, and a built-in stand.
• Price: Consider your budget and how much you are willing to spend on a touchpad keyboard.