Suppose your other 2 logo images are 150px by 70px.
This code will do just that but I wrap it in media query for screen wider than 980px, if you want them also appear in smaller screen please adjust the code as you like.
@media (min-width: 960px) {
.header-image { position: relative; }
.header-image a[rel="home"]::before,
.header-image a[rel="home"]::after {
background-image: url("https://dummyimage.com/150x70/000/fff.png");
content: ""; display: block;
width: 150px; height: 70px;
position: absolute;
left: 0; top: 0;
}
.header-image a[rel="home"]::after {
background-image: url("https://dummyimage.com/150x70/ffff00/000000.png");
left: auto; right: 0;
}
}
Do not forget to replace both of the image URLs to your own. Upload the logo into your site first and get the URLs to use.