Condensing buttons or spreading them out on mobile

Designing an app with a map feature which has to contain two separate buttons for layer changing and location finding. Originally had the two button on the bottom right, for easy access for the thumb but I heard condensing buttons too close together in mobile can cause the user to accidentally press what they don't want. So spreading the buttons out like in the right image is better, but I feel this creates more physical 'reach'?

Should controls like this be kept together or apart?