From what I’ve seen, the hotels don’t generally care as long as the person named on the reservations has employee ID or the equivalent allowing entitlement to the corporate rate. Employee travel at times including employees traveling with family are part of the normal travel picture for many a company. Whether a particular employer cares or not about the rate being used like this, can’t say much about that other than employers generally get better negotiating power when the corporate rate is used more rather than less at a given property or group of properties.