Height will depend on the name chosen and the font in the picture is 'Italic'. It is important to know that the longer the name the thinner the plaque gets. Up to around 10 letters the plaque stays at 15cm tall. Once you go past 10 letters it starts to get thinner as the length remains the same.
Also, if you are ordering this with a double barrelled name it may need to be done over an extra line otherwise the wording will be very small and so sizes will be adjusted. Therefore, the length will then be 25cm and not 30cm.
Select the shape you would like to have join the letters as well. If you would like extra hearts to hang on the bottom you can find these in the 'embellishments' category.