I believe that this will work based on feedback on this forum, however the splitter needs to be active (powered), not passive and needs to have the specs to handle whatever signal you plan to send and HDMI version. Probably best to get one with the best specs possible.
Obviously the same signal will be sent to both TVs, which makes the usefulness rather limited. I would think it more useful to use a computer with HDMI output, or a tablet or phone with a Chromecast device on one TV. In that way you could get different signals to the two TVs.
Check out my reply in the following recent thread:
The fact that something works from one device may not help with another since the signal may be different, both in strength and quality.