2 or 3 item like that should be no problem. if all your appliances work with a USB socket, why not get something like this? it would avoid clutter.
[ame="http://www.amazon.fr/allume-cigare-Technologie-AIPowerTM-smartphone-Appareils/dp/B00LISPV6G/ref=aag_m_pw_dp?ie=UTF8&m=A2UZUMHNJKCOJU"]Aukey® Chargeur allume-cigare USB 4-Port, chargeur voiture portable, 48W/9.6A (2.4A*4) équipé de la Technologie AIPowerTM pour iPhone, iPad, smartphone, Tablette Samsung et Appareils Android(9.6A Blanc): Amazon.fr: Informatique@@AMEPARAM@@http://ecx.images-amazon.com/images/I/31YwT-ogVoL.@@AMEPARAM@@31YwT-ogVoL[/ame]