A:AnswerYes you can, we had the same issue and the person at the store told us to allow it to sit straight up when we got home for 24 hours before plugging it in.
A:AnswerTry using an outlet that is not a GFCI or AFCI circuit. GFCI detect ground faults and some appliances naturally leak a little to ground which is normal, AFCI detect arc faults and can falsely trip when connected to some devices with motors. If you still have an issue after using a dedicated non GFCI/AFCI outlet then there may be a problem with the unit. The power consumption on this unit is pretty low and any standard 15A circuit should be sufficient to handle it even if other smaller loads are connected.
A:AnswerIt should come with 4. Last I remember mine had four so I would assume that is standard. It may be best to reach out to the local best buy for more guidance as that could have changed. They may also be able to get you the two replacements.