dhcp is the only service that would allocate the address. if you use an address outside of a dhcp scope, youre fine in that it wont be automatically used.
now, this is kinda different per manufacturer… but in some routers generally setting/assigning a static to an mac address is just forcing a little mini 1-to-1 dhcp scope your incoming mac to the ip you set.
i suspect this falls under the golden rule of 3… price,quality,[ethics].
you get to pick 2