Consider the following two configurations, both with lid fully open.
NT4 above the pianist's head pointedtowards the harp, and the NT-1A in the middle of the piano harp/strings facing downward towards the bass register (hinge side).
NT1A by itself half way along the strut, facing down towards the hammers or towards the middle of the piano harp. NT4 back 6-10 feet in the room, on the pianist's right.
If you have curtains in the room, then shut them. If you have the option of putting mats, blankets or mattresses around the room over / against flat hard surfaces, then do so.
Baldwins are often dull and woody in sound, so EQ add about 2dB boost at 2kHz and 12 kHz and drop 500Hz-1kHz by 2dB.
If you want honky-tonk use a chorus pedal, or a digital delay of 50ms with some feedback and some modulation.
If you want ambient then add reverb to taste.
If you want classical, then move around the room until you find the "sweet spot" where the piano sounds best. Put the mic at this position.