An IP only targeting strategy limits the amount of people a lawyer may target to those who are on the hospital wifi, which will be a smaller audience. There's a

An IP only targeting strategy limits the amount of people a lawyer may target to those who are on the hospital wifi, which will be a smaller audience. There's also a higher risk that the people on the hospital wifi and IP-range work at the hospital. While it will be good for known IP ranges to be used for targeting, it should be an additional tactic, not the only one. Geo-targeted ad-buys within an area where there may be higher concentration of hospitals, layered on with additional targeting parameters, will be the optimal setup.