In respect to this, can you put a plug on an oven?
Although it is not recommended to use an oven on a plug regardless of what the manuals say, whether or not you should plug it in to the socket locally will really depend on a variety of things specific to your household and its electrical set-up.
Beside this, are wall ovens plug in or hardwired?
All electric wall ovens must be hard wired (direct wired) into an approved junction box. A plug and receptacle is NOT permitted on these products. FOR YOUR SAFETY: Be sure your oven is installed properly by a qualified installer or service technician.
Appliances - Hard-Wired Hard-wired means the electrical cable comes furnished with the product and is physically connected or wired into the household wiring. There is NO plug to plug in. All built-in products (including built-in ovens and drop-ins) have conduit with the electrical leads attached to the range.