Available in white or chrome finish, these gel dispensers are wall mountable by either screws, silicone glue or sticky pads (all included.)  Each chamber holds 250ml of liquid and is approx 21.5cm tall.  The dispensers are easy to maintain by lifting the front cover and removing the chambers for cleaning and refilling.  

https://www.replacementtoiletseats.co.uk/ourshop/prod_2077574-Euroshowers-Mini-Chic-Square-Liquid-Gel-Dispensers-Wall-Mounted.html